xref: /freebsd/crypto/openssl/crypto/x509/x_x509.c (revision 52c2bb75163559a6e2866ad374a7de67a4ea1273)
1 /*
2  * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the OpenSSL license (the "License").  You may not use
5  * this file except in compliance with the License.  You can obtain a copy
6  * in the file LICENSE in the source distribution or at
7  * https://www.openssl.org/source/license.html
8  */
9 
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/evp.h>
13 #include <openssl/asn1t.h>
14 #include <openssl/x509.h>
15 #include <openssl/x509v3.h>
16 #include "internal/x509_int.h"
17 
18 ASN1_SEQUENCE_enc(X509_CINF, enc, 0) = {
19         ASN1_EXP_OPT(X509_CINF, version, ASN1_INTEGER, 0),
20         ASN1_EMBED(X509_CINF, serialNumber, ASN1_INTEGER),
21         ASN1_EMBED(X509_CINF, signature, X509_ALGOR),
22         ASN1_SIMPLE(X509_CINF, issuer, X509_NAME),
23         ASN1_EMBED(X509_CINF, validity, X509_VAL),
24         ASN1_SIMPLE(X509_CINF, subject, X509_NAME),
25         ASN1_SIMPLE(X509_CINF, key, X509_PUBKEY),
26         ASN1_IMP_OPT(X509_CINF, issuerUID, ASN1_BIT_STRING, 1),
27         ASN1_IMP_OPT(X509_CINF, subjectUID, ASN1_BIT_STRING, 2),
28         ASN1_EXP_SEQUENCE_OF_OPT(X509_CINF, extensions, X509_EXTENSION, 3)
29 } ASN1_SEQUENCE_END_enc(X509_CINF, X509_CINF)
30 
31 IMPLEMENT_ASN1_FUNCTIONS(X509_CINF)
32 /* X509 top level structure needs a bit of customisation */
33 
34 extern void policy_cache_free(X509_POLICY_CACHE *cache);
35 
36 static int x509_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
37                    void *exarg)
38 {
39     X509 *ret = (X509 *)*pval;
40 
41     switch (operation) {
42 
43     case ASN1_OP_D2I_PRE:
44         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data);
45         X509_CERT_AUX_free(ret->aux);
46         ASN1_OCTET_STRING_free(ret->skid);
47         AUTHORITY_KEYID_free(ret->akid);
48         CRL_DIST_POINTS_free(ret->crldp);
49         policy_cache_free(ret->policy_cache);
50         GENERAL_NAMES_free(ret->altname);
51         NAME_CONSTRAINTS_free(ret->nc);
52 #ifndef OPENSSL_NO_RFC3779
53         sk_IPAddressFamily_pop_free(ret->rfc3779_addr, IPAddressFamily_free);
54         ASIdentifiers_free(ret->rfc3779_asid);
55 #endif
56 
57         /* fall thru */
58 
59     case ASN1_OP_NEW_POST:
60         ret->ex_cached = 0;
61         ret->ex_kusage = 0;
62         ret->ex_xkusage = 0;
63         ret->ex_nscert = 0;
64         ret->ex_flags = 0;
65         ret->ex_pathlen = -1;
66         ret->ex_pcpathlen = -1;
67         ret->skid = NULL;
68         ret->akid = NULL;
69         ret->policy_cache = NULL;
70         ret->altname = NULL;
71         ret->nc = NULL;
72 #ifndef OPENSSL_NO_RFC3779
73         ret->rfc3779_addr = NULL;
74         ret->rfc3779_asid = NULL;
75 #endif
76         ret->aux = NULL;
77         ret->crldp = NULL;
78         if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data))
79             return 0;
80         break;
81 
82     case ASN1_OP_FREE_POST:
83         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data);
84         X509_CERT_AUX_free(ret->aux);
85         ASN1_OCTET_STRING_free(ret->skid);
86         AUTHORITY_KEYID_free(ret->akid);
87         CRL_DIST_POINTS_free(ret->crldp);
88         policy_cache_free(ret->policy_cache);
89         GENERAL_NAMES_free(ret->altname);
90         NAME_CONSTRAINTS_free(ret->nc);
91 #ifndef OPENSSL_NO_RFC3779
92         sk_IPAddressFamily_pop_free(ret->rfc3779_addr, IPAddressFamily_free);
93         ASIdentifiers_free(ret->rfc3779_asid);
94 #endif
95         break;
96 
97     }
98 
99     return 1;
100 
101 }
102 
103 ASN1_SEQUENCE_ref(X509, x509_cb) = {
104         ASN1_EMBED(X509, cert_info, X509_CINF),
105         ASN1_EMBED(X509, sig_alg, X509_ALGOR),
106         ASN1_EMBED(X509, signature, ASN1_BIT_STRING)
107 } ASN1_SEQUENCE_END_ref(X509, X509)
108 
109 IMPLEMENT_ASN1_FUNCTIONS(X509)
110 
111 IMPLEMENT_ASN1_DUP_FUNCTION(X509)
112 
113 int X509_set_ex_data(X509 *r, int idx, void *arg)
114 {
115     return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
116 }
117 
118 void *X509_get_ex_data(X509 *r, int idx)
119 {
120     return CRYPTO_get_ex_data(&r->ex_data, idx);
121 }
122 
123 /*
124  * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with
125  * extra info tagged on the end. Since these functions set how a certificate
126  * is trusted they should only be used when the certificate comes from a
127  * reliable source such as local storage.
128  */
129 
130 X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length)
131 {
132     const unsigned char *q;
133     X509 *ret;
134     int freeret = 0;
135 
136     /* Save start position */
137     q = *pp;
138 
139     if (a == NULL || *a == NULL)
140         freeret = 1;
141     ret = d2i_X509(a, &q, length);
142     /* If certificate unreadable then forget it */
143     if (ret == NULL)
144         return NULL;
145     /* update length */
146     length -= q - *pp;
147     if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length))
148         goto err;
149     *pp = q;
150     return ret;
151  err:
152     if (freeret) {
153         X509_free(ret);
154         if (a)
155             *a = NULL;
156     }
157     return NULL;
158 }
159 
160 /*
161  * Serialize trusted certificate to *pp or just return the required buffer
162  * length if pp == NULL.  We ultimately want to avoid modifying *pp in the
163  * error path, but that depends on similar hygiene in lower-level functions.
164  * Here we avoid compounding the problem.
165  */
166 static int i2d_x509_aux_internal(X509 *a, unsigned char **pp)
167 {
168     int length, tmplen;
169     unsigned char *start = pp != NULL ? *pp : NULL;
170 
171     /*
172      * This might perturb *pp on error, but fixing that belongs in i2d_X509()
173      * not here.  It should be that if a == NULL length is zero, but we check
174      * both just in case.
175      */
176     length = i2d_X509(a, pp);
177     if (length <= 0 || a == NULL)
178         return length;
179 
180     tmplen = i2d_X509_CERT_AUX(a->aux, pp);
181     if (tmplen < 0) {
182         if (start != NULL)
183             *pp = start;
184         return tmplen;
185     }
186     length += tmplen;
187 
188     return length;
189 }
190 
191 /*
192  * Serialize trusted certificate to *pp, or just return the required buffer
193  * length if pp == NULL.
194  *
195  * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since
196  * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do
197  * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the
198  * allocated buffer.
199  */
200 int i2d_X509_AUX(X509 *a, unsigned char **pp)
201 {
202     int length;
203     unsigned char *tmp;
204 
205     /* Buffer provided by caller */
206     if (pp == NULL || *pp != NULL)
207         return i2d_x509_aux_internal(a, pp);
208 
209     /* Obtain the combined length */
210     if ((length = i2d_x509_aux_internal(a, NULL)) <= 0)
211         return length;
212 
213     /* Allocate requisite combined storage */
214     *pp = tmp = OPENSSL_malloc(length);
215     if (tmp == NULL) {
216         X509err(X509_F_I2D_X509_AUX, ERR_R_MALLOC_FAILURE);
217         return -1;
218     }
219 
220     /* Encode, but keep *pp at the originally malloced pointer */
221     length = i2d_x509_aux_internal(a, &tmp);
222     if (length <= 0) {
223         OPENSSL_free(*pp);
224         *pp = NULL;
225     }
226     return length;
227 }
228 
229 int i2d_re_X509_tbs(X509 *x, unsigned char **pp)
230 {
231     x->cert_info.enc.modified = 1;
232     return i2d_X509_CINF(&x->cert_info, pp);
233 }
234 
235 void X509_get0_signature(const ASN1_BIT_STRING **psig,
236                          const X509_ALGOR **palg, const X509 *x)
237 {
238     if (psig)
239         *psig = &x->signature;
240     if (palg)
241         *palg = &x->sig_alg;
242 }
243 
244 int X509_get_signature_nid(const X509 *x)
245 {
246     return OBJ_obj2nid(x->sig_alg.algorithm);
247 }
248